Interesting concept.
I personally have no need for a garage at home, as the most I am likely to do myself is an oil change or something. However, I have mates that have lock ups, and end up there most weekends working on something (not often doing much myself, but just drinking beers and shooting the shit).
Not sure what my point is.... I like the idea, but how profitable would it be - ie most car dudes would already have either a garage at home or a lockup that they can keep their car in.
Just the first thing that came to mind though! Obviously could be used for more than just car stuff....